七、情态动词
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He can be at home now because the light in his room is still on. 表特别有把握的肯定判断时用must，表特别有把握的否定判断时用can, can表判断时只用在否定句中。因此把can 改为must。
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He need come here before the meeting begins. 作情态动词时need用在否定，疑问和条件句中，不能用于肯定句中，而作实意动词时则可以。所以应改为：He needs to come here before the meeting begins.
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He used to get up very early in the morning, and now he is still doing so. used to 用来表示过去常常做某事而现在不了，所以应把后半句改为：but now he is not doing so.
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I needn’t come yesterday because all the work had been finished. 由于情态动词本身不体现时态，所以在谈论过去的事情时在情态动词后加 have done，因此在 needn’t 后加have。
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You hadn’t better stay up too late because you have to get up early tomorrow. had better 的否定在 better 后面加not.
八、动词的时态
英语的常用时态有十六种，一般根据上下文和时间状语来确定时态。
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I will tell her about that when she will come tomorrow. 主句为将来时，其时间、条件、方式和让步状语从句中用一般现在时。因此将will come改为comes。
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The meeting is about to begin in ten minutes. be about to 一般不与具体的时间状语连用。因此把 in ten minutes 去掉。
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The boy opened his eyes for a moment, looking at the captain and then died. 此处look并非伴随状语，而是三个并列的谓语动词，因此把looking 改为looked。
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I have bought this bike for ten years and I am still using it now. 当句中有for加一段时间作状语时，谓语动词必须为延续性动词，此处把bought改为kept。
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I haven’t learnt any English before I came here. 我来这儿已经是过去的动作，在此之前发生的事应该用过去完成时。因此应把haven’t改为hadn’t
九、动词的语态
及物动词用在主动语态时要有宾语，因此可以变为被动语态；不及物动词用于主动语态时不能接宾语，因此无被动语态。
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The two thieves have been disappeared. disappear 为不及物动词，因此不能用于被动语态。所以把 been去掉。
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The building built now will be our teaching building. 表“现在正在建的”应用被动语态的正在进行时，因此在built 前加being。
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He is being operated by the famous doctor. 主动语态变为被动语态时，应注意短语动词的完整性，别忘了介词或副词。“给…做手术”应为operate on sb，所以在operated 后加上on。
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I wonder if the doctor has been sent. 原因同上，应在sent 后加上for。
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The book written by him is sold well. 说一本书畅销是指书本身的属性，因此不用被动语态。本句应改为：The book written by him sells well.
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This history book is worthy reading. “值得被做”可以有如下几种说法：be worth doing; be worthy of being done; be worthy to be done. 因此本句应该为：This history book is worthy to be read.
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